Implement initial transient Taskbar EDU tooltips.

Since this tooltip looks and behaves differently than the existing EDU
sheet, it has its own view and controller implementations (I also may
have wanted to write some Kotlin).

To keep transient taskbar open while on the second EDU step, another
autohide suspend flag is defined. Additionally, special casing is added
to avoid hiding transient taskbar if autohiding is currently suspended.

Tooltips use the same assets as the bottom sheet for now, and are scaled
down to fit the tooltip dimensions.

Reset `Taskbar Education` in Developer Options to try EDU again.

[Demos]
- First: https://screenshot.googleplex.com/ASBeGvrb2EA5wEF.png
- Second: https://screenshot.googleplex.com/7fnfcTh9bMYezDc.png

Test: Manual
Test: Open app, see swipe-up tooltip.
Test: Swipe up to show transient taskbar, see features tooltip.
Bug: 263157739
Fix: 258460203
Change-Id: I473f5fccbae279db0614763b640da0a120b6b7f7

quickstep/src/com/android/launcher3/taskbar/BaseTaskbarContext.java

@@ -20,6 +20,8 @@ import android.view.ContextThemeWrapper;
 import android.view.LayoutInflater;
 
 import com.android.launcher3.DeviceProfile.OnDeviceProfileChangeListener;
+import com.android.launcher3.LauncherPrefs;
+import com.android.launcher3.util.OnboardingPrefs;
 import com.android.launcher3.util.Themes;
 import com.android.launcher3.views.ActivityContext;
 
@@ -32,10 +34,12 @@ public abstract class BaseTaskbarContext extends ContextThemeWrapper implements
 
     protected final LayoutInflater mLayoutInflater;
     private final List<OnDeviceProfileChangeListener> mDPChangeListeners = new ArrayList<>();
+    private final OnboardingPrefs<BaseTaskbarContext> mOnboardingPrefs;
 
     public BaseTaskbarContext(Context windowContext) {
         super(windowContext, Themes.getActivityThemeRes(windowContext));
         mLayoutInflater = LayoutInflater.from(this).cloneInContext(this);
+        mOnboardingPrefs = new OnboardingPrefs<>(this, LauncherPrefs.getPrefs(this));
     }
 
     @Override
@@ -48,6 +52,11 @@ public abstract class BaseTaskbarContext extends ContextThemeWrapper implements
         return mDPChangeListeners;
     }
 
+    @Override
+    public OnboardingPrefs<BaseTaskbarContext> getOnboardingPrefs() {
+        return mOnboardingPrefs;
+    }
+
     /** Callback invoked when a drag is initiated within this context. */
     public abstract void onDragStart();